Combined liquid and air pump



n 7 1927. e E. HILL COMBINED LIQUID AND AIR PUMP Filed June 7., 1926uvvggvjok A TT ORNE Y Patented June 7, 1927.

UNITED STATES 1,631,591 PATENT OFFIQE. d.

EBENEZER HILL; OF SOUTH NORWALK, CONNECTICUT, ASSIGNOR TO THE HILL COM-PBESSOR & PUMP COMPANY, OF NEW YORK. N. Y., A CORPORATION OF DELAWARE.

comnmnn LIQUID Anniim rumr.

Application filed June 7,

- close to force fluid t erefrom.

The object of the present invention is to provide a pump of thischaracter which is specially designed for mixing and pumping fluidshaving diflerent qualities, such a i pump being adapted to supply fuel,for ex ample air and oil, under pressure in a vaorized condition to theburner of an oil eater. This object is attained by locating the in- Itake for air at such a point that a slight vacuum is created in thepockets during the rotation of the annular and pinion before thosepockets reach the air intake, and providing a fluid intake on the intakeside of 5 the gears as they rotate, between the discharge and the airintake whereby fluid will be first drawn into the pockets as they comearound and then air drawn in. The fluid and air become mixed in thepockets and are 1 finally discharged under'pressure with the fluidatomized. With this arrangement not only is the fluid broken up andmixed with the air and discharged under pressure, but it becomes heatedby the compressing action of the pump and somewhat gasified.vFurthermore, the fluid will act, under proper conditions, both tolubricate the movin parts and seal the joints.

In the accompanying drawings Fig. 1

shows a longitudinal section on the line 1-1 on Fig. 2, of a pump thatembodies this invention. Fig. 2 shows an end view of the pump. The pumpillustrated, as far as therotors I and their 'co-operation is concerned'is of the type shown and described in Patent #1,505,707 issued to meAugust 19, .1924.

In the pump illustrated the casing 11, which is enerally circular inoutline, contains a cyTindrical pumping chamber 2 that is closed on oneend by a head 3 which is fastened to the casing by ani suitable means.The casing has an air inta e passage 4 on one side and a dischargepassage 5 on the is a rotor 8.

1926. Serial No. 114,138.

movement axially in the ,pumping cham er The hub 9 of the. rotor ismounted on anti-friction bearings 10-the' l inner ring 11 of which isfastened to the hub While the outer ring 12 is fitted so that it mayhave a slight axlal movement in the casing. The driving shaft 13 issplined in the hub of the rotor so that while the shaft will drive therotor it will not interfere with the axial movement of the rotor.

Fastened in the rotor 8 is an internally toothed gear or annular 14, andengaging the teeth of this gear are the teeth of'an externally toothedgear or pinion 15. The pinion is mounted on anti-friction bearings 16that are supported by a stud 17 fastened in the head. This stud ispositioned out of axial line with the driving'shaft so that the axis ofthe pinion will be eccentric to the axis of the annular. The pinion,preferably, hasone less tooth than the annular and the teeth coa'ct tocause the opening and closing of the pockets 18 which effect the pumpingor compression of the fluids in the well known manner.

A spring 19 is arrangedin a cavity 20 in the casing that communicateswith the pumping chamber, in such manner that the spring thrusts againstthe outer race ring 12 and through the bearing presses the edge of. therotor and the faces of the pumping gears toward the inner face of thehead 'Lubricant is introduced into this cavity.

Leading from the reservoir 21 which is connected with the discharge andinto which the fluid is pumped, to the cavity containing the spring maybe a pipe 22. The function of this connection is to admit dischar. epressure to the cavity and permit it to e exerted on the back of therotor. This connection also is adapted to conduct back lubricant whichhas passed through the pump. Any common type of packing 23 may bearranged in the end of the casing to prevent leakage from the springcavity around the driving shaft.

In carrying out this invention a ort 24 is made through the casing headto t e path of the rotor pockets. This ort is located between the airintake port, a ove described,-

'2. On this side the pockets open as the gears turn. A pipe 25 leadingfrom the source of fluid supply, such as fuel oil, is connected by afitting 26 with this port, a needle valve being arranged in this fittingto control the flow of fluid therethrough. 7

With this arran ement of ports a slight vacuum is create in the pocketsbefore they reach the first or fluid port. This tends to draw in oil, ifoil be the fluid, through the port 24 into the pockets as they reach it,the amount bein regulated by the needle valve. If desire the oil couldbe supplied under some outside initial pressure but for ordinary usesthere is suflicient vacuum created to draw in the proper quantity of oilfor the purpose desired. When the pockets reach the air intake port airis drawn in the pockets containing the oil. As the gears move beyond ths point and the pockets decrease in volumetric capacity, the oil and airbecome mixed and'compressed and when the pockets reach the dischargeport the mixture is forced out under such pressure that the oil visatomized- Under normal conditions heat is generated by the compressionof the air and this tends to vaiporize the oil and render it morereadily in ammable. The vapor may be discharged into a tank as shown ormay be led directly to the place of use. With the connectionsillustrated pressure fromthe tank will be exerted on the back of therotors to balance the ressure on the front of the rotors, and as the airwhich exerts that pressure contains oil lubrication will be supplied tothe backs of the rotors. The oil that is drawn in bythe pump lubricatesthe front of the rotors and acts to seal the joints and ensure efficientpumping action. With this invention a single pump may be employed fordelivering 011 and air immediately to a burner.

beneath a boiler or other heater, properly mixed and vaporized, and withuniform velocity to produce the required even heat when i ited.

The invention claimed is 1. A rotary pump comprising a casing containinga pum ing chamber, an annular toothed rotor and a inion rotor rotatablein said chamber, sai annular and pinion intermeshing and mounted ineccentric relation with the latter having fewer teeth than the former,whereby pockets that open and close are produced between the teeth asthe rotors turn, a discharge port opening through the casing from thepath of contracting pockets, and a plurality of intake ports openingthrough the casing to the path plurality of intake ports opening throughthe casing to the path of the pockets, both of said intake, ports beingso located with relation to the path of the pockets that the pockets areexpanding and a partial vacuum results in the pockets before they reachthe ports as the rotors turn.

3. A rotary pump comprising a casing containing a pumping chamber, anannular toothed rotor and a inion rotor rotatable in said chamber, saiannular and pinion intermeshing and mounted in eccentric relation withthe latter having fewer teeth than the former, whereby pockets thatexpand and contract are produced between the teeth as the rotors turn, adischarge port through the casing from the pathof the pockets adjacentto the locality of greatest contraction of said pockets, an intake ortthrough the casing to the path of expanding pockets, and

an intake port through the casing to the path of the expanding pocketsbetween the discharge port. and the firstv mentioned intake port, on theintake side as the rotors turn.

4. A rotary pump comprising a casing containing a pum ing chamber, anannular toothed rotorand a inion rotor rotatable in' said chamber, saiannular and pinion intermeshing and mounted in eccentric relation withthe latter havin fewer teeth than the former, whereby poc etsthat/expand and contrac are produced between the teeth as the rotorsturn, a discharge port through the casing from the path of the pockets,adjacent to the locality of greatest contraction of said pockets, anintake port through the casing to the path 'of expanding pockets, anintake port through the casing to the path of expanding pockets betweenthe discharge port and first mentioned intake ort, on the intake side asthe rotors turn, an a valve for controlling the passage to saidintermediate intake port.

5. rotary pump comprising a casing contalning a pumping chamber, anannular toothed rotor and a pinion rotor rotatable in said chamber, saidannular and pinion intermeshing and mounted in eccentric relation withthe latter havin fewer teeth than the former, whereby poc ets thatexpand and contract are produced between the teeth as the rotors turn, adischarge port opening through the casing from the path of contractingpockets, and two intake ports opening through the casin to the path ofexpanding pockets where y liquid mey be first drawn into the pocketsthrough one intake port and air then drawn into the pockets through theother intake port by a vacuum ull, and discharged under pressure in anto intermingled vaporized condition through the discharge port, as therotors turn.

EBEZER HILL.v

